How to Get a Class 3 SOT: What You Need to Know

Types of NFA Items

Each NFA firearm category has specific federal requirements for registration, transfer, and possession under 26 U.S.C. § 5845.

Machine Guns and Full-Auto Firearms

Under 26 U.S.C. § 5845(b) , a machine gun generally includes a weapon that fires more than one shot automatically, without manual reloading, by a single function of the trigger. 18 U.S.C. § 922(o) generally prohibits the transfer or possession of machine guns unless they were lawfully possessed before May 19, 1986, or fall within a limited statutory exception. Qualified dealers may possess certain post-1986 machine guns as dealer sales samples under 27 CFR § 479.105(d) when applicable federal requirements are met.

Destructive Devices

Under 26 U.S.C. § 5845(f), destructive devices include certain explosive, incendiary, and large-bore weapons, subject to statutory exclusions and ATF classifications. Dealers in destructive devices generally need a Type 09 FFL under 27 CFR § 478.41 in addition to Class 3 SOT status, and dealing in explosive-type destructive devices may also require the appropriate federal explosives license under 27 CFR Part 555.

Short-Barreled Rifles

Under 26 U.S.C. § 5845(a)(3)-(4), a short-barreled rifle (SBR) generally includes a rifle with a barrel length under 16 inches. Certain weapons made from rifles may also qualify when they have an overall length under 26 inches or a barrel under 16 inches.

Short-Barreled Shotguns

Under 26 U.S.C. § 5845(a)(1)-(2), a short-barreled shotgun (SBS) generally includes a shotgun with a barrel shorter than 18 inches. Certain weapons made from shotguns may also fall under the NFA based on barrel length and overall length.

Suppressors (Silencers)

Under 26 U.S.C. § 5845(a)(7), suppressors, also called silencers under federal law, are devices designed to reduce the report of a portable firearm. They remain regulated as an NFA firearm even after the 2026 changes to federal NFA making and transfer taxes under the One Big Beautiful Bill Act.

Any Other Weapon (AOW)

Under 26 U.S.C. § 5845(e), Any Other Weapon is an NFA classification covering certain concealable weapons and devices described by federal law, including certain smooth-bore and combination firearms, subject to statutory exclusions. AOWs remain subject to applicable NFA registration and transfer requirements.

Ongoing Compliance Responsibilities for Class 3 SOTs

Annual SOT Renewal Cycle

Under 26 U.S.C. § 5801(a), the SOT tax year runs from July 1 through June 30. Existing SOT taxpayers must pay for the new tax year on or before July 1. A dealer beginning taxable NFA business after July 1 must pay before engaging in that business and still owes the full $500 Class 3 SOT because the tax is not prorated under the “a year or fraction thereof” language of 26 U.S.C. § 5801(a).

Under ATF’s Information Collection revision, the preprinted renewal forms (Forms 5630.5R and 5630.5RC) that ATF previously sent to SOT payers are no longer required, and Form 5630.7 is now the only form necessary. As a result, FFL holders should track the renewal deadline carefully. Late payment results in interest and may also result in penalties under applicable Internal Revenue Code provisions.

Recordkeeping Expectations for NFA Dealers

Federal firearms licensees operating as a Class 3 SOT remain subject to applicable NFA recordkeeping requirements under 27 CFR Part 479 and Gun Control Act recordkeeping requirements under 27 CFR § 478.121-125.

Good NFA recordkeeping practices include:

• Complete acquisition and disposition entries
• Accurate serial number, model, caliber, or gauge information
• Clear identification of NFA inventory
• Tracking transfer status and supporting ATF forms
• Compliance with applicable federal, state, and local requirements

Consistent records can reduce errors and help keep an FFL/SOT prepared for an ATF compliance inspection.

Transfer Documentation and Timing

NFA transfers require specific ATF documentation depending on the parties involved.

Dealer-to-dealer transfers between qualified SOTs generally use ATF Form 3, the Application for Tax-Exempt Transfer of Firearm and Registration to Special Occupational Taxpayer, under 27 CFR § 479.88. These transfers are tax-exempt but still require applicable ATF approval.

Dealer-to-consumer NFA transfers generally use ATF Form 4 under 27 CFR § 479.84 and remain subject to federal registration and approval requirements.

Beginning January 1, 2026, the federal making and transfer tax was reduced to $0 for NFA firearms other than machine guns and destructive devices under the One Big Beautiful Bill Act (H.R. 1). Machine guns and destructive devices remain subject to the $200 tax under 26 U.S.C. § 5811. The NFA registration and approval process remains in effect.

This includes suppressors, short-barreled rifles, short-barreled shotguns, and AOWs.

The change did not eliminate NFA registration or the Special Occupational Tax. A firearm dealer conducting NFA business must still maintain the appropriate FFL and SOT status. For more information, see FastBound’s NFA Tax Stamp guide.

2026 SOT Regulatory Proposals

ATF proposed two rules in May 2026 as part of its New Era of Reform package that could affect FFL/SOT operations. As of August 2026, both remain proposed rules rather than current federal law.

RIN 1140-AA76 would clarify that FFLs who pay the Special Occupational Taxpayer fee under the NFA owe one SOT per business activity (manufacturing, importing, or dealing) at a given location, regardless of the number of GCA licenses the FFL holds at that location. RIN 1140-AA75 would revise procedures for post-1986 machine gun transfers between qualified manufacturers, importers, and dealers in two limited circumstances: demonstrating firearms to government entities and when a licensee is discontinuing business.

FFL/SOT holders should continue following current requirements unless these proposed changes become final.

ATF Inspections and Audit Readiness

ATF compliance inspections can include reviews of required records, firearm inventory, transfer documentation, current FFL and SOT status, and other compliance requirements.

Keeping NFA and non-NFA records organized and current helps inspections proceed more efficiently and reduces disruption to normal business operations.

FastBound’s Impact on Compliance and Growth

FastBound helps federal firearms licensees manage firearm transactions, maintain accurate records, and organize both NFA and non-NFA inventory.

With FastBound, users gain access to:

• Electronic ATF Form 4473: Helps simplify Form 4473 completion with built-in validation designed to reduce incomplete or incorrect forms.
• Background Check Integration: Integrates with NICS and supported state systems to simplify background check workflows.
• Bound Book Maintenance: Helps FFL holders maintain accurate acquisition and disposition records and organized firearm inventory.

For an FFL with SOT status, accurate records are especially important when managing NFA firearms alongside standard firearm sales. FastBound helps firearm dealers organize records, track transactions, and maintain inspection-ready information while focusing on their business.

Start your free trial today to see how FastBound can support your business.